Topic 1, Web-based Solution
Background
You are developing a web-based solution that students and teachers can use to
collaborate on written assignments. Teachers can also use the solution to detect potential
plagiarism, and they can manage assignments and data by using locally accessible
network shares.
Business Requirements
The solution consists of three parts: a website where students work on assignments and
where teachers view and grade assignments, the plagiarism detection service, and a
connector service to manage data by using a network share.
The system availability agreement states that operating hours are weekdays between
midnight on Sunday and midnight on Friday.
Plagiarism Service
The plagiarism detection portion of the solution compares a new work against a repository
of existing works. The initial dataset contains a large database of existing works. Teachers
upload additional works. In addition, the service itself searches for other works and adds
those works to the repository.
Technical Requirements
Website
The website for the solution must run on an Azure web role.
Plagiarism Service
The plagiarism detection service runs on an Azure worker role. The computation uses a
random number generator. Certain values can result in an infinite loop, so if a particular
work item takes longer than one hour to process, other instances of the service must be
able to process the work item. The Azure worker role must fully utilize all available CPU
cores. Computation results are cached in local storage resources to reduce computation
time.
Repository of Existing Works
The plagiarism detection service works by comparing student submissions against a
repository of existing works by using a custom matching algorithm. The master copies of
the works are stored in Azure blob storage. A daily process synchronizes files between
blob storage and a file share on a virtual machine (VM). As part of this synchronization, the
ExistingWorkRepository object adds the files to Azure Cache to improve the display
performance of the website. If a student's submission is overdue, the Late property is set to
the number of days that the work is overdue. Work files can be downloaded by using the
Work action of the TeacherController object
Network Connector
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Clients can interact with files that are stored on the VM by using a network share. The
network permissions are configured in a startup task in the plagiarism detection service.
Service Monitoring
The CPU of the system on which the plagiarism detection service runs usually limits the
plagiarism detection service. However, certain combinations of input can cause memory
issues, which results in decreased performance. The average time for a given computation
is 45 seconds. Unexpected results during computations might cause a memory dump.
Memory dump files are stored in the Windows temporary folder on the VM that hosts the
worker role.
Security
Only valid users of the solution must be able to view content that users submit. Privacy
regulations require that all content that users submit must be retained only in Azure
Storage. All documents that students upload must be signed by using a certificate named
DocCert that is installed in both the worker role and the web role.
Solution Development
You use Microsoft Visual Studio 2013 and the Azure emulator to develop and test both the
compute component and the storage component. New versions of the solution must
undergo testing by using production data.
Scaling
During non-operating hours, the plagiarism detection service should not use more than 40
CPU cores. During operating hours, the plagiarism detection service should automatically
scale when 500 work items are waiting to be processed. To facilitate maintenance of the
system, no plagiarism detection work should occur during non-operating hours. All
ASP.NET MVC actions must support files that are up to 2 GB in size.
Biographical Information
Biographical information about students and teachers is stored in a Microsoft Azure SQL
database. All services run in the US West region. The plagiarism detection service runs on
Extra Large instances.
Solution Structure
Relevant portions of the solution files are shown in the following code segments. Line
numbers in the code segments are included for reference only and include a two-character
prefix that denotes the specific file to which the line belongs.
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You need to configure storage for the solution.
What should you do? To answer, drag the appropriate XML segments to the correct
locations. Each XML segment may be used once, more than once, or not at all. You may
need to drag the split bar between panes or scroll to view content.
Answer:
Question No : 1 DRAG DROP - (Topic 1)
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You are deploying the web-based solution in the West Europe region.
You need to copy the repository of existing works that the plagiarism detection service
uses. You must achieve this goal by using the least amount of time.
What should you do?
A. Copy the files from the source file share to a local hard disk. Ship the hard disk to the
West Europe data center by using the Azure Import/Export service.
B. Create an Azure virtual network to connect to the West Europe region. Then use
Robocopy to copy the files from the current region to the West Europe region.
C. Provide access to the blobs by using the Microsoft Azure Content Delivery Network
(CDN). Modify the plagiarism detection service so that the files from the repository are
loaded from the CDN.
D. Use the Asynchronous Blob Copy API to copy the blobs from the source storage
account to a storage account in the West Europe region.
Answer: D
Explanation:
Ref: http://blogs.msdn.com/b/windowsazurestorage/archive/2012/06/12/introducing-
asynchronous-cross-account-copy-blob.aspx
Question No : 2 - (Topic 1)
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You need to find all existing works about World History that are overdue and are stored in
the repository.
How should you complete the relevant code? To answer, select the appropriate option or
options in the answer area.
Answer:
Question No : 3 HOTSPOT - (Topic 1)
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You need to insert code at line WR16 to implement the GetWork method.
How should you complete the relevant code? To answer, drag the appropriate code
segment to the correct location. Each code segment may be used once, more than once,
or not at all. You may need to drag the split bar between panes or scroll to view content.
Answer:
The Compute method in the PlagiarismCalculation class takes a significant amount of time
to load existing works from blob storage. To improve performance, the service must load
existing works from the cache.
Question No : 4 DRAG DROP - (Topic 1)
Question No : 5 HOTSPOT - (Topic 1)
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